Mechanism



(No Model.) 3 Sheets-Sheet 1.

G. E. WITHERELL. ULUTGHING MECHANISM.

No. 504,770. Patented Sept. 12, 1893.-

(No Model.) 3 SheLtei-Slaeet 2. G. E. WITHERELL. ULUTGHING MECHANISM No.504,770. Patented Sept 12 1893.

Kama/MAM ale/TL;

(No Model.) 3 Sheets-Sheet 3;

G. E. WITHERELL. GLUTGHING MECHANISM- No. 504,770; Patented Sept. 12,1893.

UNITED STATES PATENT OFFICE.

GEORGE E. IVITHERELL, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE HARTFORDMACHINE SCREW COMPANY, OF SAME PLACE.

CLUTCHING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 504,770, datedSeptember 12, 1893.

Application filed January 19, 1893. $erial No. 458,917- (No model.)

T at whom it may concern.- direction or in opposite directions at thesame Be it known that I, GEORGE E. WITHERELL, or at difierent speeds.

of Hartford, in the county of Hartford and In the accompanying drawingsthe lettero;

State of Connecticut, have invented certain denotes the spindle that issupported in bear new and useful Improvements in Clutching ings b in theframe I). A loose pulley c is 55 Mechanism, of which the following is afull, mounted on the shaft and preferably arranged clear, and exactdescription, whereby any one next to the bearing, the hub c afiording askilled in the art can make and use the same. proper lateral bearingforthe pulley. On one The object of my invention is to provide side ofthe pulley 0 there is formed a socket 0 means for driving a shaft in anydesired diin which a split ring (1 forming part of the 60 rection and atvarying speeds and to this end clutch mechanism is located. This ring issemy invention consists in the details of the cured at one or morepoints to the disk ethat several parts making up the clutch device asfits closel'y within an expanding ring located a whole and in thecombination of such parts in the socket 0 The hub of this disk is seasmore particularly hereinafter described cured to the shaft as by meansof a clamping 6 and pointed out in the claims. screw c extending throughthe hub on the Referring to the drawings: Figure 1 is a dedisk andengaging the shaft so that the disk tail view in side elevation of partof a screw and shaft will move together. On the shaft cutting machinethat embodies my invention. there is also supported asliding collargwhich Fig. 2 is a longitudinal section taken on a hasa limitedreciprocating movement and is 70 vertical plane passing through the axisof provided with projecting arms g that extend spindle a in Fig. 1. Fig.3 is a detail viewin through openings 6 in the disk, one set of thecross section through the device on plane dearms having sockets a intowhich the end of noted by line 06% of Fig. 1 and looking toa toggle-armh projects. This collar has an ward the right. Fig. 4 is a detail viewin annular groove g formedin its periphery and 75 cross section throughthe clutch parts lookadapted to receive the forked end of ashifter ingtoward the left. Fig. 5 is a detail view on lever by means of which thisclutch part may enlarged scale showing the adjacent ends of be movedlengthwise of the shaft. The split a split ring with part cut away toshow conring cl fits snugly within the socket c in the struction. Fig. 6is a detail end view of the side of the pulley and is so arranged thatwhen 80 eccentric pivot of the cam. Fig. 7 is a detail expanded it willgrasp the pulley with a firm side view of the same. Fig. 8 is a detailplan hold. view of the locking ring. Fig. 9 is a detail The expandingdevice comprises a cam edge view of the same. Fig.10is atransverse blockt pivoted to the end of the ring at one section taken on theliney-y ofFig. 1, showside of the opening d and having an end 85 ing a face viewof the fixed ring and the bearing a cam 2", the surface of whichenclutching mechanism co-operating therewith. gages the cam surface dformed on the oppo- In the within drawings and specification site end ofthe split ring. This cam block is my invention is shown and described asemmounted on an eccentric 3'' formed midway of bodied in part of a screwmachine in which the pin j, one end of which fits a socket in 0 theobject is to drive the work holding spinthe ring on one side of theblock/while the dle forward with a fast motion, then to con otherextends through a locking ring that tinue the forward motion of thespindle with is seated in a threaded socket in the side of a slowmotion, and after that to drive it in a the split ring cl and on theopposite side of the 5 reverse direction with a fast motion in orderblock. This pin is tape red so as to fit a ta- 5 to accomplish a specialwork to be done on pered perforation in the'nut. The object of themachine. Myimprovement is equally apthis construction is to enable thecenter of the plicable, however, without material change pivot whichsupports the cam block to be set to any shaft to which it is desired togive a at any distance within the throw of the eerotary movement atdifferent speeds in one centric from that end of the ring which bears10o the cam surface. This adj ustability of the cam block enables thedegree of expansion of the ring by the sliding movement of the collar tobe nicely adjusted. The cam block is operated by a toggle h that ispivoted to the back of the block and has its opposite end in engagementwith the socket in the arm g of the sliding collar g. A similararrangement of clutch parts is connected to the pulley f, the sockets inthese respective pulleys c, f, being formed in adjacent sides of thepulley, the sliding collar operating to engage the pulley c at one endof its sliding movement and the pulley f at the other end of its play.The hub of the disk appurtenant to the clutch mechanism of the loosepulley f is clamped to theshaft by the set screw 6 so as to turn withit. The pulley c is normally driven at a rate of speed in the directionof the arrow shown in Fig. 1 that will cause it when connected totheshaft to drive the latter forward with a fast motion. The pulley f isdriven normally in a reverse direction and at a speed that will cause itwhen clutched to the spindle a togive the latter a fastmotion exceptwhen the movement of this latter pulley is translated and reduced bymeans of a system of gears. A sleeve Z is arranged on the spindle, itshub being secured to the hub of the pulley f as by means of a key Z sothat the sleeve will be driven with the pulley f. 011 the outer end ofthis sleeve is a pinion Z the teeth projecting from the surface of thesleeve aslight distancesufficient to form a shoulder between which andthe face of the pulley f the hub m of a disk m is held, but free torevolve on the sleeve. A fixed ring 0?. is secured to the bed I) andwithin this ring is arrangeda split ring 77. similar in construction tothe one already described as forming part of the clutch mechanismappurtenant to the pulleys cl and f. The disk m may be clamped to thering or through the medium of the expanding ring n by a sliding movementof a collar 0 that is loosely mounted on the hub m of the disk at and isengaged with the ring at by means of a toggle lever h. An annular gear19 having teeth upon the inside, as shown in Fig. 4: of the drawings, isarranged so as to overhang the pinion Z and leave an annular spacebetween the two gears. This annular gear is secured to or forms part ofa disk 19, the hub of which is keyed to the spindle a by a key if so asto turn with it. Intermediate gears q are mounted on the disk m on pinsor pivots q with their teeth engaging the annular gear 10 and the teethof the pinion Z When the \disk on is clamped to the fixed ring by meansof the shifting device 0 operated by any convenient form of shiftinglever it will be anchoredto the fixed ring 02 through theinstrumentality of the toggle h, cam block 2' and the split ring an. andthus hold the intermediate gear gin a fixed position with respect to theaxis of the spindle a. The result of this will be that the pinion Zwhich is driven in the same direction as the pulley j" will turn theintermediate gears in a reverse direction owing to the fact that thedisk on which these gears are pivoted is held fast against any turningmovement. The intermediate gears q gearing into the annular gear 1)drive the latter in a reverse direction or in the same direction as thatin which the pinion turns and as this annular gear 19 is secured to thespindle it will drive the latter in the same direction but with a slowerspeed. As the pulley f turns in a reverse direction to the pulleyc itwill be seen that this slow motion of the spindle a is in a reversemotion and at a slower speed than is the motion given to the spindle aby means of the pulley o. By unclutching the disk at by a reverse motionof the shifter collar 0 the spindle-a is released and it may be thendriven forward with a fast motion by the operation of the clutchingmechanism appurtenant to the pulley f, that is, by moving the sleeve gsoas to cause the clutching'mechanism to clamp the pulley f to the diskappurtenant of the clutch mechanism of that pulley, the hub of said diskbeing secured to the spindle a. as by means of the clamping screw 6'that passes through it into the spindle. The spindle dis idle and notaffected by this driving mechanism of course when the several clutchdevices are disengaged.

In the accompanying drawings the device is shown with parts arranged soas to drive the spindle in a reverse direction with a fast motion.

I claim as my invention- 1. In combination with a spindle and itsbearings, mechanism for driving the spindle with a variable speed andcomprising a loose pulley mounted on the shaft and driven in onedirection, a second loose pulley mounted on the shaft and driven in areverse direc-- tion, the clutch mechanisms as described ap purtenant tothe pulleys, a sleeve secured to one of the pulleys and turning with itand havingon its outer end a pinion, an annular gear fixed on a disksecured to the spindle, a fixed ring appurtenant to the annular gear thedisk of the clutch mechanism appurtenant to the fixed ring supporting aninterme diate gear located between the annular gear and the pinion andthe clutch mechanism appurtenant to the fixed ring, all substantially asdescribed.

2. In combination with a spindle and its bearings two loose pulleysmounted on the shaft and driven normally in opposite directions, clutchmechanisms located between the adjacent faces of the pulleys and adaptedto clamp either of them to the shaft a shifter ring that is arranged inoperative connection with the clamping parts of the clutch device, asleeve bearing a pinion secured to one of the pulleys and turning withit and the described mechanism including a fixed ring and clutch and theannular and intermediate gears whereby the rotary movement of the pulleybearing the sleeve and pinion is reduced in speed, all substantially asdescribed.

3. In a clutch mechanism the combination of an expanding ring, a camblock pivoted to one end of the ring on one side of the open ing andhaving on the outer end a cam face cooperating with a cam formed on theend of the ring on the opposite side of the opening, and an eccentricpivot hinging the cam block to the ring, all substantially as described.

4. In combination in a clutch mechanism, an expanding-ring, a pivot-pinbearing an eccentric arranged across a socket in one end GEORGE E.WITHERELL.

Witnesses:

CHAS. L. BURDETT, A. B. JENKINSQ

